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Day and night mode switching method of CCD camera

A mode conversion, camera technology, applied in photography, image communication, color TV components and other directions, can solve the problem of uncontrollable sensitivity, etc., to achieve the effect of making up for the blank of the gain value that cannot be adjusted

Inactive Publication Date: 2012-07-11
SHENZHEN HUANGHE DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using a photoresistor to control the day and night conversion, its sensitivity is uncontrollable

Method used

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  • Day and night mode switching method of CCD camera
  • Day and night mode switching method of CCD camera
  • Day and night mode switching method of CCD camera

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Embodiment Construction

[0033] like figure 1 As shown, the present invention discloses a method for switching between day and night modes of a CCD camera, which includes the following steps: In step S1, the real-time gain value and the real-time shutter speed value are read. In step S2, it is judged whether the gain value in step S1 is greater than the preset threshold value, and if it is greater than the preset threshold value, then step S3 is executed; otherwise, step S1 is executed. In step S3, control the CCD camera to switch to night mode. In step S4, when the infrared lamp is turned on, read the real-time shutter speed value and the real-time gain value again, and use the shutter speed value read at this time as a reference shutter speed value, and use the gain value read at this time as a reference gain value. In step S5, it is judged whether the reference gain value is greater than the set value, if it is greater than the set value, then execute the step of judging the gain value, otherwise...

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Abstract

The invention provides a day and night mode switching method of a CCD camera. The invention has the following advantages that: in a program, megapixel CCD video detection technology is utilized to substitute a photovaristor to control day and night switching. A sensor carried by the camera can transmit a yield value to a back end which is interior of the program, external brightness information is determined by utilizing the yield value, the yield value is small when brightness is high, the yield value is large when the brightness is low, thus, it is needed to raise gain to raise the brightness when light is dim. Conversely, when the yield value is large, it shows that the light is dim, and a day and night switching work mode of the camera is controlled. Thus, a blank that the yield value can not be adjusted by using the photovaristor is made up, and repeated switching because of brightness change caused by misjudgement of the photovaristor and on and off of an infrared lamp can be avoided.

Description

technical field [0001] The invention relates to a method for switching camera working modes, in particular to a method for switching day and night modes of a CCD camera. Background technique [0002] At present, most infrared cameras use photoresistors to control the opening and closing of infrared lights. Photoresistors are very sensitive to light, and their resistance varies greatly under different light intensity. Infrared cameras use photoresistors as infrared light switches. For example, when the light is strong, the resistance of the photoresistor is very small. For a control circuit, it is turned on. Using the turn-on performance to control a switch to turn it off, the infrared lamp does not work; and vice versa. This is exactly what makes the IR lights off during the day and on at night. [0003] Since the photoresistor is an electronic component, its service life is limited. When it works for a long time, its sensitivity will also decrease, and under the influence ...

Claims

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Application Information

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IPC IPC(8): H04N5/232G03B15/05
Inventor 周波陈永刚
Owner SHENZHEN HUANGHE DIGITAL TECH
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